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SNCR denitration system for cement kiln flue gas

A cement kiln and denitrification technology, applied in the directions of dispersed particle separation, chemical instruments and methods, combined devices, etc., can solve the problems of reducing the effective contact between the reducing agent and the flue gas, reducing the utilization rate of the reducing agent, and increasing the NOx content, so as to achieve denitrification. Efficiency improvement, volume reduction, effect of reducing adhesion

Active Publication Date: 2015-10-28
JIANGSU LINGYANG CEMENT ENG TECH
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AI Technical Summary

Problems solved by technology

On the one hand, this reduces the effective contact between the reducing agent and the flue gas, reducing the utilization rate of the reducing agent; The NOx content in the gas will reduce the denitrification efficiency and increase the consumption of reducing agent

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  • SNCR denitration system for cement kiln flue gas

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Embodiment Construction

[0017] The invention discloses a cement kiln flue gas SNCR denitrification system, that is, a system for denitrifying cement kiln flue gas by using a selective non-catalytic reduction (SNCR, Selective Non-Catalytic Reduction) method. Based on the original cement line, this system bypasses a part of the hot waste gas from the gas outlet of the C1 cyclone and enters the dust removal filter for dust removal and purification, and then the hot waste gas enters the reducing agent atomization device, where the reducing agent droplets and The hot waste gas undergoes heat and mass exchange, evaporates to become reducing agent vapor, and the reducing agent vapor is inhaled by the fan to increase the pressure and then sent to the denitrification injection point of the decomposition furnace. Since the reducing agent vapor generated by the system can be well mixed and contacted with the nitrogen oxides in the flue gas, the denitrification efficiency can be improved, and at the same time, th...

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Abstract

The invention discloses an SNCR denitration system for cement kiln flue gas. A bypass of the system is attached to a cement kiln system. The SNCR denitration system comprises a hot gas pipeline, a reducing agent atomizing device, a pressurizing apparatus and a reducing agent steam pipeline, wherein an inlet of the hot gas pipeline is connected with a gas outlet located on the cement kiln system; an outlet of the hot gas pipeline is connected with a gas inlet of the reducing agent atomizing device; a reducing agent steam outlet of the reducing agent atomizing device is connected with a denitration injection point of a decomposing furnace through a reducing agent steam pipeline so as to realize conveying of formed reducing agent steam to the decomposing furnace; and the pressurizing apparatus is arranged on the reducing agent steam pipeline to pressurize the reducing agent steam. Through mixing and contact of the reducing agent steam produced by the system and nitrogen oxide in the flue gas, denitration efficiency is improved, and consumption of a reducing agent is reduced on the premise of same denitration efficiency.

Description

technical field [0001] The invention belongs to the technical field of cement kiln air pollutant emission control, and relates to a cement kiln flue gas denitrification system, in particular to a selective non-catalytic reduction (SNCR, Selective Non-Catalytic Reduction) method for flue gas denitrification systems and equipment. Background technique [0002] SNCR denitrification technology has been widely used in flue gas denitrification in cement plants, that is, injecting reducing agent (ammonia water or urea solution) to the flue gas in the cement decomposition furnace. NOx is converted to nitrogen (N 2 ) and water (H 2 o). [0003] At present, in the cement kiln SNCR denitrification system, atomization media such as compressed air are usually used to atomize the reducing agent, and the reducing agent solution is atomized into droplets of suitable particle size through a spray gun and sprayed into the decomposition furnace. When the size of the cement calciner is smal...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56B01D50/00
Inventor 王建立龚汉保
Owner JIANGSU LINGYANG CEMENT ENG TECH
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